FIELD: agriculture. SUBSTANCE: hotbed and conservatory frame includes body 1, cover 2, adjusted protective screen 3 made in the form of film cover with reflecting surface and provided with elastic spiral hoses 5. Hoses are connected to source of compressed - gas. With supply of compressed gas into elastic hoses, screen unrolls occupying horizontal position in parallel to cover to decrease losses of heat and to control light mode. EFFECT: decreased losses of heat, increased functional efficiency of operation of frame. 3 dwg
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